Thank you for posting here in the Community, @llugo.
An email preference is a possible reason why you got this issue. What you need to do is to check for the email set up in your QuickBooks.
If you are currently using Outlook and getting this problem, here are the steps to follow:
1. Close your QuickBooks. 2. Open the Windows Start menu. 3. Enter "QuickBooks" then right-click the QuickBooks icon and click on open file location. 4. Right-click the QuickBooks.exe file in the folder and select Properties. 5. Choose the Compatibility tab. 6. Uncheck the Run this program as Administrator option. Once the option is grayed out, select Show Settings for All Users to make it visible. 7. Hit Apply and then OK.
Also, be sure that your QuickBooks isn't set to automatically run as an administrator.
If you are using a Webmail, here are the steps:
1. Go to Edit menu. 2. Click Preferences. 3. Choose Send Forms. 4. Select WebMail then Add. 5. Enter your email address. 6. Pick the Use Enhanced Security checkbox and select OK.
I’ve added an article about how to fix the issue if the Outlook option is missing in the preference or you are unable to email transactions using Webmail: